There's no doubt that the more you do of these, the more proficient you become. A ten minute canter over breakfast gets the brain cells working and sets me up for the day. A good general knowledge is helpful, but not essential and the answers contained in the book ensure that misery only lasts a few moments. Splendid.
As a crossword addict, particularly when travelling, these pocket sized books are perfect for sticking in hand luggage to while away the waiting / flight time. There's a good mix of clues, some more difficult than others - but it is amazing what you find you know! Would definitely recommend the series.
Great sized book for taking out with you to pass the time while you are on the bus or train, or waiting to see the doctor/dentist etc etc. Not particularly easy but maybe that says more about me than the book. I love crosswords and like being stretched. I get bored if I find them too easy.